CVE-2022-49300 (GCVE-0-2022-49300)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:10 – Updated: 2025-12-23 13:23
VLAI?
Title
nbd: fix race between nbd_alloc_config() and module removal
Summary
In the Linux kernel, the following vulnerability has been resolved: nbd: fix race between nbd_alloc_config() and module removal When nbd module is being removing, nbd_alloc_config() may be called concurrently by nbd_genl_connect(), although try_module_get() will return false, but nbd_alloc_config() doesn't handle it. The race may lead to the leak of nbd_config and its related resources (e.g, recv_workq) and oops in nbd_read_stat() due to the unload of nbd module as shown below: BUG: kernel NULL pointer dereference, address: 0000000000000040 Oops: 0000 [#1] SMP PTI CPU: 5 PID: 13840 Comm: kworker/u17:33 Not tainted 5.14.0+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Workqueue: knbd16-recv recv_work [nbd] RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd] Call Trace: recv_work+0x3b/0xb0 [nbd] process_one_work+0x1ed/0x390 worker_thread+0x4a/0x3d0 kthread+0x12a/0x150 ret_from_fork+0x22/0x30 Fixing it by checking the return value of try_module_get() in nbd_alloc_config(). As nbd_alloc_config() may return ERR_PTR(-ENODEV), assign nbd->config only when nbd_alloc_config() succeeds to ensure the value of nbd->config is binary (valid or NULL). Also adding a debug message to check the reference counter of nbd_config during module removal.
Severity ?
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 165cf2e0019fa6cedc75b456490c41494c34abb4 (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 2573f2375b64280be977431701ed5d33b75b9ad0 (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 8a7da4ced236ce6637fe70f14ca18e718d4bf9e9 (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 122e4adaff2439f1cc18cc7e931980fa7560df5c (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 71c142f910da44421213ade601bcbd23ceae19fa (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 2888fa41985f93ed0a6837cfbb06bcbfd7fa2314 (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < d09525720dd5201756f698bee1076de9aefd4602 (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < c55b2b983b0fa012942c3eb16384b2b722caa810 (git)
Create a notification for this product.
    Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 4.14.283 , ≤ 4.14.* (semver)
Unaffected: 4.19.247 , ≤ 4.19.* (semver)
Unaffected: 5.4.198 , ≤ 5.4.* (semver)
Unaffected: 5.10.122 , ≤ 5.10.* (semver)
Unaffected: 5.15.47 , ≤ 5.15.* (semver)
Unaffected: 5.17.15 , ≤ 5.17.* (semver)
Unaffected: 5.18.4 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: fix race between nbd_alloc_config() and module removal\n\nWhen nbd module is being removing, nbd_alloc_config() may be\ncalled concurrently by nbd_genl_connect(), although try_module_get()\nwill return false, but nbd_alloc_config() doesn\u0027t handle it.\n\nThe race may lead to the leak of nbd_config and its related\nresources (e.g, recv_workq) and oops in nbd_read_stat() due\nto the unload of nbd module as shown below:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000040\n  Oops: 0000 [#1] SMP PTI\n  CPU: 5 PID: 13840 Comm: kworker/u17:33 Not tainted 5.14.0+ #1\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\n  Workqueue: knbd16-recv recv_work [nbd]\n  RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd]\n  Call Trace:\n   recv_work+0x3b/0xb0 [nbd]\n   process_one_work+0x1ed/0x390\n   worker_thread+0x4a/0x3d0\n   kthread+0x12a/0x150\n   ret_from_fork+0x22/0x30\n\nFixing it by checking the return value of try_module_get()\nin nbd_alloc_config(). As nbd_alloc_config() may return ERR_PTR(-ENODEV),\nassign nbd-\u003econfig only when nbd_alloc_config() succeeds to ensure\nthe value of nbd-\u003econfig is binary (valid or NULL).\n\nAlso adding a debug message to check the reference counter\nof nbd_config during module removal."
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[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnbd: fix race between nbd_alloc_config() and module removal\\n\\nWhen nbd module is being removing, nbd_alloc_config() may be\\ncalled concurrently by nbd_genl_connect(), although try_module_get()\\nwill return false, but nbd_alloc_config() doesn\u0027t handle it.\\n\\nThe race may lead to the leak of nbd_config and its related\\nresources (e.g, recv_workq) and oops in nbd_read_stat() due\\nto the unload of nbd module as shown below:\\n\\n  BUG: kernel NULL pointer dereference, address: 0000000000000040\\n  Oops: 0000 [#1] SMP PTI\\n  CPU: 5 PID: 13840 Comm: kworker/u17:33 Not tainted 5.14.0+ #1\\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\\n  Workqueue: knbd16-recv recv_work [nbd]\\n  RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd]\\n  Call Trace:\\n   recv_work+0x3b/0xb0 [nbd]\\n   process_one_work+0x1ed/0x390\\n   worker_thread+0x4a/0x3d0\\n   kthread+0x12a/0x150\\n   ret_from_fork+0x22/0x30\\n\\nFixing it by checking the return value of try_module_get()\\nin nbd_alloc_config(). As nbd_alloc_config() may return ERR_PTR(-ENODEV),\\nassign nbd-\u003econfig only when nbd_alloc_config() succeeds to ensure\\nthe value of nbd-\u003econfig is binary (valid or NULL).\\n\\nAlso adding a debug message to check the reference counter\\nof nbd_config during module removal.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.283\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.247\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.198\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.122\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.47\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17.15\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18.4\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.19\", \"versionStartIncluding\": \"4.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-12-23T13:23:09.889Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49300\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-12-23T13:23:09.889Z\", \"dateReserved\": \"2025-02-26T02:08:31.534Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-26T02:10:35.594Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.